If the chemical sodium is dropped into water it will immediately and violently explode.
67
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A cubic yard of air weighs about 2 pounds at sea level.
31
Nylon is made from coal and petroleum.
42
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61